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Unified Diff: src/mips64/codegen-mips64.cc

Issue 2070813002: Revert of [builtins] Introduce proper Float64Exp operator. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 4 years, 6 months ago
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Index: src/mips64/codegen-mips64.cc
diff --git a/src/mips64/codegen-mips64.cc b/src/mips64/codegen-mips64.cc
index a8f58904014b0f6f5a1cd2ea99ecdd992973ecae..678f606cb5716135c0e66a135f35da0c3d390473 100644
--- a/src/mips64/codegen-mips64.cc
+++ b/src/mips64/codegen-mips64.cc
@@ -15,6 +15,59 @@
#define __ masm.
+
+
+#if defined(USE_SIMULATOR)
+byte* fast_exp_mips_machine_code = nullptr;
+double fast_exp_simulator(double x, Isolate* isolate) {
+ return Simulator::current(isolate)->CallFP(fast_exp_mips_machine_code, x, 0);
+}
+#endif
+
+
+UnaryMathFunctionWithIsolate CreateExpFunction(Isolate* isolate) {
+ size_t actual_size;
+ byte* buffer =
+ static_cast<byte*>(base::OS::Allocate(1 * KB, &actual_size, true));
+ if (buffer == nullptr) return nullptr;
+ ExternalReference::InitializeMathExpData();
+
+ MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size),
+ CodeObjectRequired::kNo);
+
+ {
+ DoubleRegister input = f12;
+ DoubleRegister result = f0;
+ DoubleRegister double_scratch1 = f4;
+ DoubleRegister double_scratch2 = f6;
+ Register temp1 = a4;
+ Register temp2 = a5;
+ Register temp3 = a6;
+
+ __ MovFromFloatParameter(input);
+ __ Push(temp3, temp2, temp1);
+ MathExpGenerator::EmitMathExp(
+ &masm, input, result, double_scratch1, double_scratch2,
+ temp1, temp2, temp3);
+ __ Pop(temp3, temp2, temp1);
+ __ MovToFloatResult(result);
+ __ Ret();
+ }
+
+ CodeDesc desc;
+ masm.GetCode(&desc);
+ DCHECK(!RelocInfo::RequiresRelocation(desc));
+
+ Assembler::FlushICache(isolate, buffer, actual_size);
+ base::OS::ProtectCode(buffer, actual_size);
+
+#if !defined(USE_SIMULATOR)
+ return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer);
+#else
+ fast_exp_mips_machine_code = buffer;
+ return &fast_exp_simulator;
+#endif
+}
#if defined(V8_HOST_ARCH_MIPS)
@@ -1037,6 +1090,94 @@
__ bind(&done);
}
+
+static MemOperand ExpConstant(int index, Register base) {
+ return MemOperand(base, index * kDoubleSize);
+}
+
+
+void MathExpGenerator::EmitMathExp(MacroAssembler* masm,
+ DoubleRegister input,
+ DoubleRegister result,
+ DoubleRegister double_scratch1,
+ DoubleRegister double_scratch2,
+ Register temp1,
+ Register temp2,
+ Register temp3) {
+ DCHECK(!input.is(result));
+ DCHECK(!input.is(double_scratch1));
+ DCHECK(!input.is(double_scratch2));
+ DCHECK(!result.is(double_scratch1));
+ DCHECK(!result.is(double_scratch2));
+ DCHECK(!double_scratch1.is(double_scratch2));
+ DCHECK(!temp1.is(temp2));
+ DCHECK(!temp1.is(temp3));
+ DCHECK(!temp2.is(temp3));
+ DCHECK(ExternalReference::math_exp_constants(0).address() != NULL);
+ DCHECK(!masm->serializer_enabled()); // External references not serializable.
+
+ Label zero, infinity, done;
+ __ li(temp3, Operand(ExternalReference::math_exp_constants(0)));
+
+ __ ldc1(double_scratch1, ExpConstant(0, temp3));
+ __ BranchF(&zero, NULL, ge, double_scratch1, input);
+
+ __ ldc1(double_scratch2, ExpConstant(1, temp3));
+ __ BranchF(&infinity, NULL, ge, input, double_scratch2);
+
+ __ ldc1(double_scratch1, ExpConstant(3, temp3));
+ __ ldc1(result, ExpConstant(4, temp3));
+ __ mul_d(double_scratch1, double_scratch1, input);
+ __ add_d(double_scratch1, double_scratch1, result);
+ __ FmoveLow(temp2, double_scratch1);
+ __ sub_d(double_scratch1, double_scratch1, result);
+ __ ldc1(result, ExpConstant(6, temp3));
+ __ ldc1(double_scratch2, ExpConstant(5, temp3));
+ __ mul_d(double_scratch1, double_scratch1, double_scratch2);
+ __ sub_d(double_scratch1, double_scratch1, input);
+ __ sub_d(result, result, double_scratch1);
+ __ mul_d(double_scratch2, double_scratch1, double_scratch1);
+ __ mul_d(result, result, double_scratch2);
+ __ ldc1(double_scratch2, ExpConstant(7, temp3));
+ __ mul_d(result, result, double_scratch2);
+ __ sub_d(result, result, double_scratch1);
+ // Mov 1 in double_scratch2 as math_exp_constants_array[8] == 1.
+ DCHECK(*reinterpret_cast<double*>
+ (ExternalReference::math_exp_constants(8).address()) == 1);
+ __ Move(double_scratch2, 1.);
+ __ add_d(result, result, double_scratch2);
+ __ dsrl(temp1, temp2, 11);
+ __ Ext(temp2, temp2, 0, 11);
+ __ Daddu(temp1, temp1, Operand(0x3ff));
+
+ // Must not call ExpConstant() after overwriting temp3!
+ __ li(temp3, Operand(ExternalReference::math_exp_log_table()));
+ __ Dlsa(temp3, temp3, temp2, 3);
+ __ lwu(temp2, MemOperand(temp3, Register::kMantissaOffset));
+ __ lwu(temp3, MemOperand(temp3, Register::kExponentOffset));
+ // The first word is loaded is the lower number register.
+ if (temp2.code() < temp3.code()) {
+ __ dsll(at, temp1, 20);
+ __ Or(temp1, temp3, at);
+ __ Move(double_scratch1, temp2, temp1);
+ } else {
+ __ dsll(at, temp1, 20);
+ __ Or(temp1, temp2, at);
+ __ Move(double_scratch1, temp3, temp1);
+ }
+ __ mul_d(result, result, double_scratch1);
+ __ BranchShort(&done);
+
+ __ bind(&zero);
+ __ Move(result, kDoubleRegZero);
+ __ BranchShort(&done);
+
+ __ bind(&infinity);
+ __ ldc1(result, ExpConstant(2, temp3));
+
+ __ bind(&done);
+}
+
#ifdef DEBUG
// nop(CODE_AGE_MARKER_NOP)
static const uint32_t kCodeAgePatchFirstInstruction = 0x00010180;
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